PD#OTT-5671
[Problem]
The irda_setsockopt function in net/irda/af_irda.c and later in
drivers/staging/irda/net/af_irda.c in the Linux kernel before 4.17
allows local users to cause a denial of service (ias_object
use-after-free and system crash) or possibly have unspecified other
impact via an AF_IRDA socket.
[Solution]
The irda_setsockopt() function conditionally allocates memory for a new
self->ias_object or, in some cases, reuses the existing
self->ias_object. Existing objects were incorrectly reinserted into the
LM_IAS database which corrupted the doubly linked list used for the
hashbin implementation of the LM_IAS database. When combined with a
memory leak in irda_bind(), this issue could be leveraged to create a
use-after-free vulnerability in the hashbin list. This patch fixes the
issue by only inserting newly allocated objects into the database.
[Test]
Change-Id: Idbdc870be0064e331969b39a7b6e447c16a9073a
Signed-off-by: Hanjie Lin <hanjie.lin@amlogic.com>
27a1861d28